systemu is a portable replacement for popen4 in ruby.
systemu can be used on any platform to return status, stdout, and stderr of
any command. unlike other methods like open3/popen4 there is zero danger of
full pipes or threading issues hanging your process or subprocess.
WWW: http://codeforpeople.com/lib/ruby/systemu/
PR: ports/145845
Submitted by: renchap at cocoa-x.com